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/* A "buffer" utility type.
   Copyright (C) 1998, 2000, 2003 Free Software Foundation, Inc.
 
This file is part of GCC.
 
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
 
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to
the Free Software Foundation, 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */
 
/* Written by Per Bothner <bothner@cygnus.com>, July 1998. */
 
/* A simple data structure for an expandable buffer. */
 
struct buffer
{
  /* The start of the actual data buffer. */
  unsigned char *data;
 
  /* Where to write next in the buffer. */
  unsigned char *ptr;
 
  /* The end of the allocated data buffer. */
  unsigned char *limit;
};
 
#define NULL_BUFFER { (void*) 0, (void*) 0, (void*) 0 }
 
#define BUFFER_INIT(BUFP) \
  ((BUFP)->data = NULL, (BUFP)->ptr = NULL, (BUFP)->limit = NULL)
 
#define BUFFER_LENGTH(BUFP) ((BUFP)->ptr - (BUFP)->data)
 
#define BUFFER_RESET(BUFP) ((BUFP)->ptr = (BUFP)->data)
 
extern void buffer_grow (struct buffer*, int);